CVE-2025-37992: Linux kernel · net_sched: Flush gso_skb list too during ->change()
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 5 Nov 2026, 21:51 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 26 May 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
What to do
AI-suggested
A patch has been applied to the Linux kernel that introduces qdisc_dequeue_internal() to properly flush both the gso_skb list and the main skb queue during qdisc limit changes. Users should update to the fixed Linux kernel versions containing this patch. No other mitigation is indicated.
Description
A vulnerability in the Linux kernel's network scheduler (net_sched) was fixed where reducing a qdisc's limit during the ->change() operation did not properly flush the gso_skb list, potentially causing a NULL pointer dereference. The fix ensures both the gso_skb list and the main skb queue are flushed when trimming excess packets, preventing this issue.
References
- git.kernel.org/stable/c/ea1132ccb112f51ba749c56a912f67970c2cd542 (opens in a new tab)
- git.kernel.org/stable/c/d3336f746f196c6a53e0480923ae93939f047b6c (opens in a new tab)
- git.kernel.org/stable/c/d38939ebe0d992d581acb6885c1723fa83c1fb2c (opens in a new tab)
- git.kernel.org/stable/c/a7d6e0ac0a8861f6b1027488062251a8e28150fd (opens in a new tab)
- git.kernel.org/stable/c/d1365ca80b012d8a7863e45949e413fb61fa4861 (opens in a new tab)
- git.kernel.org/stable/c/fe88c7e4fc2c1cd75a278a15ffbf1689efad4e76 (opens in a new tab)
- git.kernel.org/stable/c/2d3cbfd6d54a2c39ce3244f33f85c595844bd7b8 (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/10/msg00007.html (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/08/msg00010.html (opens in a new tab)